Buggy code:
public class SyntacticAnalyzer { private LexicalAnalyzer lex ; boolean error ; Token lookAheadToken ; String lookAhead ; Writer writer ; Writer grammarWriter ; public SyntacticAnalyzer ( ) throws IOException { } public void handleFile ( String file ) throws IOException { } public void closeWriter ( ) throws IOException { } public void setLexReader ( Reader reader ) throws IOException { } private boolean skipErrors ( String [ ] first , String [ ] follow ) throws IOException { } private void writeError ( ) throws IOException { } private boolean match ( String strToMatch ) throws IOException { } private boolean lookAheadIsIn ( String lookAhead , String ... strToMatchArr ) { } private String getLookAhead ( ) { } public boolean parse ( ) throws IOException { } private boolean prog ( ) throws IOException { } private boolean classDeclList ( ) throws IOException { } private boolean classDecl ( ) throws IOException { } private boolean varFuncDefs ( ) throws IOException { } private boolean varFuncDef ( ) throws IOException { } private boolean varFuncDefTail ( ) throws IOException { } private boolean varDefTail ( ) throws IOException { } private boolean funcDefTail ( ) throws IOException { } private boolean progBody ( ) throws IOException { } private boolean funcDefList ( ) throws IOException { } private boolean funcDef ( ) throws IOException { } private boolean funcHead ( ) throws IOException { } private boolean funcBody ( ) throws IOException { } private boolean varDeclStatList ( ) throws IOException { } private boolean varDeclStat ( ) throws IOException { } private boolean varDeclStatTail ( ) throws IOException { } private boolean varDeclTail ( ) throws IOException { } private boolean statmentTail ( ) throws IOException { } private boolean variableTail1 ( ) throws IOException { } private boolean variableTail2 ( ) throws IOException { } private boolean statementList ( ) throws IOException { } private boolean statement ( ) throws IOException { } private boolean altstatement ( ) throws IOException { } private boolean assignStat ( ) throws IOException { } private boolean statBlock ( ) throws IOException { } private boolean expr ( ) throws IOException { } private boolean relExprTail ( ) throws IOException { } private boolean arithExpr ( ) throws IOException { } private boolean arithExprTail ( ) throws IOException { } private boolean sign ( ) throws IOException { } private boolean term ( ) throws IOException { } private boolean termTail ( ) throws IOException { } private boolean factor ( ) throws IOException { } private boolean factorTail ( ) throws IOException { } private boolean factorTail2 ( ) throws IOException { <START_BUG> if ( ! ( skipErrors ( new String [ ] { Constants . ID } , new String [ ] { Constants . LT , Constants . LESSEQ , Constants . NOTEQ , Constants . EQCOMP , Constants . GT , Constants . GREATEQ , Constants . SEMICOLON , Constants . CLOSEPAR , Constants . COMMA , Constants . CLOSESQBRACKET , Constants . PLUS , Constants . MINUS , Constants . RESERVED_WORD_OR , Constants . MULTIPLY , Constants . DIV , Constants . RESERVED_WORD_AND } ) ) ) <END_BUG> return false ; if ( lookAheadIsIn ( lookAhead , new String [ ] { Constants . POINT } ) ) { if ( ( ( match ( POINT ) ) && ( match ( ID ) ) ) && ( factorTail ( ) ) ) { grammarWriter . write ( "factorTail2<seq2seq4repair_space>-><seq2seq4repair_space>\'.\'<seq2seq4repair_space>\'id\'<seq2seq4repair_space>factorTail\n" ) ; } else { error = true ; } } else if ( lookAheadIsIn ( lookAhead , new String [ ] { Constants . LT , Constants . LESSEQ , Constants . NOTEQ , Constants . EQCOMP , Constants . GT , Constants . GREATEQ , Constants . SEMICOLON , Constants . CLOSEPAR , Constants . COMMA , Constants . CLOSESQBRACKET , Constants . PLUS , Constants . MINUS , Constants . RESERVED_WORD_OR , Constants . MULTIPLY , Constants . DIV , Constants . RESERVED_WORD_AND } ) ) { grammarWriter . write ( "factorTail2<seq2seq4repair_space>-><seq2seq4repair_space>EPSILON\n" ) ; } else { error = true ; } return ! ( error ) ; } private boolean variable ( ) throws IOException { } private boolean variableTail ( ) throws IOException { } private boolean idnest ( ) throws IOException { } private boolean indiceList ( ) throws IOException { } private boolean indice ( ) throws IOException { } private boolean arraySizeList ( ) throws IOException { } private boolean arraySize ( ) throws IOException { } private boolean type ( ) throws IOException { } private boolean nonidtype ( ) throws IOException { } private boolean fParams ( ) throws IOException { } private boolean aParams ( ) throws IOException { } private boolean fParamsTailList ( ) throws IOException { } private boolean fParamsTail ( ) throws IOException { } private boolean aParamsTails ( ) throws IOException { } private boolean aParamsTail ( ) throws IOException { } private boolean assignOp ( ) throws IOException { } private boolean relOp ( ) throws IOException { } private boolean addOp ( ) throws IOException { } private boolean multOp ( ) throws IOException { } }

Fix:
if ( ! ( skipErrors ( new String [ ] { Constants . POINT } , new String [ ] { Constants . LT , Constants . LESSEQ , Constants . NOTEQ , Constants . EQCOMP , Constants . GT , Constants . GREATEQ , Constants . SEMICOLON , Constants . CLOSEPAR , Constants . COMMA , Constants . CLOSESQBRACKET , Constants . PLUS , Constants . MINUS , Constants . RESERVED_WORD_OR , Constants . MULTIPLY , Constants . DIV , Constants . RESERVED_WORD_AND } ) ) )